Basic Configuration Options

Most options are held in non-volatile RAM, which can be examined or altered by running diagnostic program 67.

The configuration bytes which are available in every 9914V, regardless of options or interfaces, are described in this section and tabulated at the end.

Configuration bytes 14, 15, 17 & 19, which are specific to particular interfaces, are set out in the appendices.

4.1 Configuration Bytes 01 to 05 - Operator Options

These bytes are displayed under diagnostic program 67 as at)t)reviated messages which may be examined and/or altered as described in Section 5.

Byte Function

01 DNSDI5-1 - Density displayed until' run/stop' pressed DNSDI5-0 ,. Density displayed for 5 seconds only 02 AutoOpen - Option not applicable to the 9914 V model

Man Open

-03 Aut ONL - 9914V is automatically on-line atter threading tape Man ONL - 9914V is on-line only after' LD/ONL ^I is pressed 04 Au1:oLoad:a 9914V thieads tape to BOT on closing tile ioading door

Man Load - 9914V threads tape when' LDIONL 'button is pressed 05 Unit XX - Where XX is the current unit address

(valid in the range 0 to 7)

95 125456 {Draft Issue Dl R~~i~ r.l"Infinllr~ti(\n ()ntil"lnc::. ^{A _ 1}

Configuration bytes 06 onwards are displayed under diagnostic program 67 in hexadecimal notation; they may be examined and/ or altered as described in Section 5.

4.2 Configuration Byte 06 - Host Interface Options A

4-2

Bit Interpretation

7 1 - EOT latched until passed again in reverse

0-EOT pulsed every time the marker is detected (except in rewind) 6 1 - IOFL sets streamer off-line, no other action

0- IOFL sets streamer off-line, rewinds to BOT, unthreads tape 5 1 = All forward commands rejected after EOT limit is set

o

=- No command restrictions after EOT limit is set

(user must ensure that physical end-of-tape is not reached) 4 1

=

Incoming write data checked for odd parity, IHER set if error

(and bit 0 in status byte F7); used with bit 3 below 0= Incoming write data parity ignored, odd parity generated

3 1 - DPE/PE or NRZ write data parity is written to tape, even if wrong;

enables even parity tapes, but R-A-W data causes IHER to set (GCR ignores incoming parity, for writing to tape)

0= OPEl PE or NRZ write data parity is corrected before writing to tape 2 1

=

Automatic density analysis (at conclusion of threading) is inhibited

(default density - byte 16 - is assumed) (GCR read auto-calibration is not operative) 0= Automatic density analysis is enabled

1 1 - Pertee INRZ interface line is set when GCR density is selected (valid after IDBY set during first command from BOT)

0- INRZ has NRZ density meaning only

o

If the density is changed after analyse:

1 - read @ analyse density, write from BOT @ new density

o -

read @ analyse density, write from BOT @ new density;

if no previous read, write at analyse density.

See Figure 4.2.

9914V Servicing Manual 95 125456 (Draft Issue D)

:) n

.4 .)

n

~

n

I)

J ,

)

~

i"

~ )

~

DENSITY IS AS ANALYSED

DENSITY IS AS ANALYSED

DENSITY IS NEW DENSITY

NO

DENSITY IS DEFAULT

DENSITY IS AS PREVIOUS WRITE

YES

YES

DENSITY IS AS ANALYSED

NO

DENSITY I S \ AS ANALYSEI'.J

FIGURE

4.2

BYTE

^6.

BIT

⁰

DENSITY POSSIBILITIES

YES

DENS I TY I~)

NEW DENSITY

4.3 Configuration Byte 07 - Host Interface Options B

4-4

Bit Interpretation

7 - 4 1

=

Gap before a file mark is normal IBG

o ⁼

Gap before a file mark is 3.5 inches Bit 7 .. GCR gap

Bit 6 .. P E 1600 gap Bit 5 .. DPE 3200 gap Bit 4 .. NRZ gap

Note: when streaming, the gap after a file mark may be longer than normal, when byte 12 is set for Variable Gap.

3 1

=

IRSTR strobes generated with NRZ LRC & CRC characters 0= IRSTR strobes not generated with NRZ LRC & CRC characters 2 1 .. ICER true (in GCR write) for double-track error correction

o ..

ICER true (in GCR) fOi single Oi double-tiack correction Default

=

1; note: this option affects ICER in GCR density only 1 Note: this feature requires revision 05 DDP firmware and

assembly state 25 Data Control board

1

=

Read strobes continue after multi-track errors in PE densities, but beware that the MTE read tracks will be set to zero

o

= Read strobes cease after multi-track errors in PE densities

o

Note: this feature requires revision 05 DD P firmware and assembly state 25 Data Control board

1 .. AGC on while writing, as well as while reading

o =

AGC on while reading only.

Recommended setting - 0

9914V Servicing Manual 95 125456 (Draft Issue D)

4.4 Configuration Byte 08 - Host Interface options C

Bit Interpretation

7 Note: this feature requires assembly state 26 Data Control board 1 == PE and GCR CERs flagged as HERs only

o

^~ CERs flagged as CERs

6 1 == IFBY clears immediately after IDBY clears

(facilitates streaming by hosts which re-instruct from IFBY) 0:11 IFBY clears after the re-instruct time has expired

5 1 == IFBY set true on the leading edge of the command strobe IGO

o

== IFBY set true on the trailing edge of the command strobe IGO Note: the PCI board has its own edge selecting option 4 1 - 9914V responds to the host irrespective of IFEN state, but IFEN going high terminates the current command

0== IFEN must be asserted before on-line status is possible, even if correctly addressed by host, or placed on-line at the front panel IFEN must be asserted for commands to be accepted

Note: pulsing IFEN dears IHER & leER, either option setting 3 Note: this feature requires assembly state 27 Data Control board

1 == Set IHER on long blocks. ie after several seconds.

This avoids reading to EOT if a tape with continuous data (eg certification pattems or diagnostic data) is loaded 0-IHER timeoul is not active

2 - 0 Unit address settings:

b2 b1 bO

0 0 0 Unit address 0

0 0 1 Unit address 1

.. and so on ...

1 1 Unit address 7

QS 1 '5456 (Dr~ft 1~~tJP' D\ R~~i(" r.nnfinllr~tit"\n nntinn~

.1._"

4.5 Configuration Byte 09 - Host Interface options 0

4-6

Bit Interpretation

7 1

=

Disable 3200 bpi I DENT when reading (no interface IIDENT even if one is present) 0- Enable 3200 bpi IDENT reporting across interface 6 1 .. Disable 3200 bpi IDENT when writing

o

^=-Enable 3200 bpi IDENT when writing 5 1 .. IHER & ICER pulsed at end of block

(no need to justify errors with IDBY)

o

=- IHER & ICER set until cleared

4 1 - Ignore read IDENT error from BOT and read first block 0= tape halted if IDENT error from BOT during read,

, **

IDENT' displayed. IHER set. bit 7 of status byte F10 set Note: when writing from BOT, IDENT error is flagged

as for' 0 ' setting

3 1 - An illegal command sequences IDBY & IFBY as normal

o

=-An Illegal command sets and clears IFBY, IDBY unaffected,

(host informed of reject command without reference to status bytes) (Rejected commands set bit 7 of status byte F7,

regardless of this option)

2 1 .. 3200 bpi read commands enabled, write commands rejected

o =

3200 bpi read commands & write commands enabled 1 1 .. Density mismatch sets IHER, and bit 2 of F14

o -

Density mismatch sets bit 2 of F14, but does not set IHER

a

Analyse density setting if no ident burst is found;

if no data activity is found in the first 25 feet of tape, the density defaults to the config byte 16 setting.

1 .. Analyse density default is 3200 or 800 bpi if no ident burst is found depending on the data activity in the first 25 feet

o ..

Analyse density default is 800 bpi when no ident burst is found

9914 V Servicing Manual 95 125456 (Draft Issue D)

4.6 Configuration Byte 10 - Conditions which set Incomplete

Note: ' incomplete' is bit 6 of status byte Fl.

Bit Interpretation

All 1 - the status byte INCOMPLETE bit is set and IHER is asserted 0-the status byte REJECT bit is not set (IHER is not asserted),

(but another status byte bit may be set)

1 No read-after-write data detected during writing (RWFAIL) 6 BOT detected during Read Reverse (RRD @

BOn

5 BOT detected during File Search Reverse (FSR BOT) 4 Blank tape found during Read (BLANK TAPE)

3 IFEN asserted during an operation (IFEN)

2 A data glitch was found, but not a valid data block 1 There was an unexpected gap in the R-A-W data

o

No erase current detected during a write operation (/WTNG)

95 1 ?5458 (Draft Issue D) R~~i~ r.l'\nfinllr~tinn ()ntinn~ .4-7

4.7 Configuration Byte 11 - Conditions Which Set Reject

Note: ' reject ^I is bit 7 of status byte F7.

Bit Interpretation

All 1 - the status byte REJECT bit is set and IHER is asserted

7 6 5

o

= the status byte REJECT bit is not set (IHER is not asserted), (but another status byte bit may be set)

4 Forward motion requested when tape is at EOT limit (EOTLIM CMD (applies only if bit 5 of config byte 06 is set)

3 Command code was not recognised -eg invalid combination (INV CMD) 2 Reverse command received while at BOT (REV @ BOT)

1 Write command received, to a file-protected tape (FPTD)

o

Set density command received while away from BOT (DENS /BOT)

4.8 Configuration Byte 12 - IBG Size

When the 9914 V is streaming, byte 12 determines the gap which follows a block of data (or a file mark). When set to a variable code, the gap ceases when a new command is

received, should this not happen before the maximum gap, a reposition cycle is entered and the resulting inter-block gap is of normal length (assuming the new command is Write).

If the 9914V repositions on every block. the resutting tape thus contains IBGs of normal length, regardless of the setting of byte 12.

4-8 9914 V Servicing Manual 95 125456 (Draft Issue D)

Bit Interpretation

3 - 0 Least significant nibble, PE/NRZ gap size Hex code

Im Dokument 9914V TAPE UNIT SERVICING MANUAL (Seite 81-90)